The Travel Network Group marketing director Si Morris-Green has left with immediate effect.
He will be taking a few months off to be with his young family and will then look for new opportunities in the industry.
He added: "I’ve had the best time at The Travel Network Group over the past six years and achieved a great deal in terms of my own personal development and growth."
CEO Gary Lewis said he will now consider options to recruit for a new senior marketing position.
"It is with great sadness that Si has decided to leave The Travel Network Group," he said.
"During the six years that Si has been with us he has driven a strategy that has seen us deliver industry-leading marketing services to our Members and develop a cruise tour operating capability that is growing all the time.
"His overall contribution to our development as a Group has been significant and we are grateful for his input, commitment and support over the years.
"Lisa and Vim and I have thoroughly enjoyed working alongside Si and will miss him greatly, as I am sure will many colleagues from across our business. However, he leaves us with very strong and talented teams in both marketing and Cruise Club.
